Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118.1245b&link_type=abstract
The Astronomical Journal, Volume 118, Issue 3, pp. 1245-1251.
Astronomy and Astrophysics
Astronomy
44
Galaxy: Globular Clusters: Individual: Messier Number: M54, Stars: Abundances
Scientific paper
Chemical abundances in five stars in M54, a globular cluster associated with the Sagittarius dwarf galaxy, have been determined using high-resolution echelle spectra. We find the cluster to have [Fe/H]=-1.55 and possibly halo-normal abundance patterns, although the [O/Fe] and [alpha/Fe] ratios lie between solar and the normal halo values. One star shows the combination of low oxygen and enhanced Na and Al, symptomatic of deep mixing of ON-cycle and other proton-capture products; a second star shows a lesser degree of O depletion unaccompanied by Na and Al excesses. In the cluster Eu is also enhanced, indicating that about 30% of the Ba in the cluster is due to the r-process. In general, M54 is similar to globulars of comparable metallicity in the inner Galactic halo, despite its clear association with the Sagittarius dwarf spheroidal.
Brown Jeffery A.
Gonzalez Guillermo
Wallerstein George
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